Steam-generator.



No. 796,565. 7 PATBNTED AUG.'8, 1905.

D. GROWTHE-R.

STEAM GENERATOR.

APPLIOATION rum) NOV. 1, 1904.

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- PATENTED AUG. 8, 1905.

' D. GROWTHER.

STEAM GENERATOR.

APPLICATION FILED NOV. 1, 1904.

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UNITED sTArEs PATENT OFFICE.

DAVID (JROWTHER, OF LEEDS, ENGLAND, ASSIGNOR TO GLOVERS WATER TUBE BOILER COMPANY LIMITED, OF LEEDS, ENGLAND.

STEAM-GENERATOR.

Patented Aug. 8, 1905.

Application filed November 1, 1904. Serial No. 230,927.

To all whom, it may concern:

Be it known that I, DAVID CROWTHER, a subject of the King of Great Britain and Ireland, and a resident of Leeds, in the county of York, England, have invented a certain new and useful Improvement in Steam Generators, of which the following is a specification.

This invention refers to a new construction of steam-generator, the object of which is to combine the advantages of the Scotch or marine type of boiler with those of the watertube and locomotive types of boilers, and thereby to obtain great efficiency, combined with large and rapid steaming capacity for the size and weight of the boiler, and to increase the efficiency of the flame-tubes of the same. These objects I effect by forming the boiler as a cylindrical or approximately cylindrical shell the upper part of which is prolonged a short distance to the rear and inserting flame-tubes in the middle and lower part of the shell and using these as return-tubes and in forming the sides of the fire-box or furnace which is placed below the cylindrical shell and the sides and rear of the combustion chamber of watertubes having each both an up and down current or circulation, the water tubes being placed close together, or nearly so, side by side, and those forming the sides of the fire-box or furnace with their upper ends fitted into the under side of the cylindrical shell at some distance on each side of the central vertical plane through the shell, so as to cause a rapid circulation of the water between said return flame-tubes, thereby causing immediate disengagement of the steam as it is formed on the upper sides of these tubes, thus greatly increasing their efficiency.

A boiler thus constructed is illustrated in longitudinal section by Figure 1 of the accompanying drawings, while the right half of Fig. 2 shows a cross-section through the furnace or fire-box looking toward the combustion-chamber, and the left half of Fig. 2 is a cross-section through the combustion-chamber looking toward the firelooxthat is, on lines A B and D, respectively, of Fig. 1.

(0 indicates the cylindrical or approximately cylindrical shell of the boiler, and Z) the short extension of the upper part of the same to the rear to form the roof of the combustion-chamher.

0 indicates the flame-tubes inserted in the middle and lower part of the main cylindrical portion of the boiler and which serve as return-tubes from the combustion-cham ber (Z to the uptake 0 at the front of the boiler.

g indicates the water-tubes forming the longitudinal sides of the furnace or' fire-box, A being the fire-grate and i the fire-bridge. The tubes 9 are preferably of the double flow type and secured to the boiler-shell both as described in the specification accompanying my application of same date as this present for Letters Patent for an improvement in the furnaces or fire-boxes and combustion-chambers of steam-generators. The tubes are placed close together side by side, or nearly so, so as to form a flame-tight wall, and their upper ends fitted, respectively, to the right and left in and through the under side of the cylindrical part of the boiler-shell, thereby leading to an active circulation of the water about the flame-tubes c, greatly increasing their efficiency.

The rearward extension of the upper part of the boiler-shell may be constructed of any suitable form and character.

VVater-tubes y, similar to the water-tubes g, placed close together side by side, or nearly so, in single rows, are made to form the side and back walls of the combustion-chamber and have their upper ends inserted in and through the under side of the above-mentioned rear extension of theupper part of the boiler-shell. The spaces between the upper ends of the tubes g and of the tubes j may be closed by fire-brick blocks Z, Fig. 2, or by other suitably shaped and supported firebricks placed on the outside of the upper ends of the tubes. The space necessarily left between the last of the furnace water-tubes g and the first of the tubes j, forming the sides of the combustion-cham her about and immediately to the front of the rear tube-plate m,

is closed by a transverse wall a n of firebrick, of which the lower middle portion forms the fire-bridge 2', while the upper middle portion protects the rear bottom edge of the boiler-shell from the wasting action of the flame passing through the opening 0 in the middle of the wall a, said opening 0 leading from the furnace or fire-box to the combustion-chamber d.

g is the front flame-tube plate.

The top of the boiler and the outer sides of the tubes 9 and are preferably covered with a lagging or lining of non-conducting material and the top, sides, and rear of the boiler inclosed in a sheet-iron casing r.

I am aware that steam-generators-have been constructed in which water-tubes having a continuous How in one direction through them have been used in combination with circular shells or drums and have formed the side walls of the furnace. I do not, therefore, claim such a combination broadly; but

What I do claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a cylindrical or approximately cylindrical boiler-shell a, a short extension I) of the upper part of the shell to the rear, front and rear tube-plates q and m, return flame-tubes 0, two rows of double-flow water-tubes g side by side on the right and left sides of the furnace respectively and having their upper ends fitted to the right and left in and through the under side portions of the shell a, two side and one rear wall of double-flow water-tubes j side by side at the sides and rear of the combustion-chamber (Z respectively and having their upper ends fitted in and through the under side of said rear extension Z),stopping-up fire-blocks land crosswall 92 having a flame-opening 0 through it, as set forth.

2. The combination of a cylindrical or approximately cylindrical boiler-shell ct, a short extension I) of the'upper part of the same to the rear, rear and front tube-plates m and q,

return flame-tubes c in the middle and lower part of the shell a, a row of double-flow water-tubes 9 side by side on each side of the fire-grate it having their upper ends fitted in and through the under side portions of the shell (1/, two side and one rear wall of doubleflow water-tubes 7' side by side at the sides and rear of the combustion-chamber (Z respectively and having their upper ends fitted in and through the underside of said rear extension b, and cross-wall at having a flameopening 0 through it. substantially as set forth.

3. The combination of a boiler-shell a, a short extension 6 of the upper part of the same to the rear, rear and front flame-tube plates m and q, return flame-tubes 0, two rows of double water-tubes 9 side by side having their upper ends fitted in and through the under side parts of the shell-plate a, fire-grate it, and side and rear combustion chamber walls of double-flow water-tubes j with their upper ends fitted in and through the under side of said rear extension 5, substantially as set forth.

4:. The combination of a boiler-shell a, a short extension 6 of the upper part of the same to the rear, front and rear flame-tube plates q and m, return flame-tubes 0 in the lower half of said shell (0, fire-grate 7b, and a row of double-flow water-tubes g'side by side on each side of said fire-grate it and with their upper ends fitted in and through the under side parts of the shell-plate a, substantially as set forth.

5. The combination of a cylindrical boiler shell to, a short extension 6 of the upper part of the same to the rear, front and back tubeplates 9 and m, return flame-tubes 0, two side walls and one rear wall of double-flow watertubes j side by side and with their upper ends fitted in and through the under side of said rear extension Z) along the sides and rear of the combustion-chamber, substantially as set forth.

6. The combination of a cylindrical boilershell (0, an end extension 6 of the upper part of the same, tube-plates m and g, flame-tubes 0, two side walls of double-flow water-tubesj side by side and with their upper ends fitted into and through the under side of said end extension 6 along the sides of the same.

7. The combination of a cylindrical boilershell (0, a short rear extension 5 of the upper part of the same, tube-plates m and q, flametubes 0. and arow of double-flow water-tubesj with their upper ends fitted into and through the under side of said rear extension near and parallel to the rear end of the same.

8. The combination of a cylindrical boilershell a a short extension Z) of the same to the rear, tube-plates m and q, return flame-tubes 0, two furnace side walls of water-tubes g having their upper ends fitted in and, through the under side portions of the shell (0 to the right and left respectively, and two side walls and one rear wall of water-tubes 7' beneath and litted at their upper ends into the under side of said rear extension I).

9. The combination of a cylindrical boilershell a, a short extension 5 of the upper part of the same to the rear, tube-plates m and (1, return flame-tubes 0, two side walls of watertubes g with their upper ends fitted to the right and left in the under side of the shell a respectively. and a combustion-cl1amber rl.

10. The combination of a fire-box and a combustionchamber connected thereto, with a boiler-shell having its body above said fire-box and a contracted extension above said combustion-chamber, flame-tubes extending through the body of said shell and communicating with said combustion-chamber, and water-tubes forming the sides of said fire-box and combustion-chamber. the water-tubes on the respective sides being connected to said shell, substantially as specified.

11. The combination of a fire-box and combustion-chamber connected thereto, with a boiler-shell having its body above said firebox and a contracted extension above said combustion-chamber, flame-tubes extending through the body of said shell and communieating with said combustion-chamber, Watertubes forming the sides of said fire-box and connected to the body of said shell, and watertubes forming the sides and back of said combustion-chamber and connected to the contracted extension of said shell, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

DAVID CROWTHER.

Witnesses:

J. CLARK JEFFERSON, ERNEST J AOKSON. 

